The Makaiju arc is an early set of episodes from the Sailor Moon anime series. It makes up the first segment of the Sailor Moon R series, and is unique to the anime. This arc was literally filler, made to fill the time while Naoko Takeuchi finished the first series' story arc for the manga. It comprises episodes 47-59 in Japanese, or 41-53 in English, and is named after one of its unique figures, an alien tree.